Hands-free mobile phone use while driving

After finally getting around to putting the effort into a hands free kit for mobile use in the car, these are my findings and works pretty well!

Hardware

Phone device:

Samsung s7 edge

Bluetooth device:

I do not have a stereo system or head unit in my daily-driver that is Bluetooth capable. In fact it is the original stereo from Japan which only has a frequency rage of...  todo. 

Rather than install a stereo system capable of bluetooth, what I did was purchased a roidmi device. See url: https://xiaomi-mi.com/fm-transmitters/

This device transmits audio via a set FM channel of your choosing to your existing car stereo.

You wont need this if your stereo is already Bluetooth capable (which many are)